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Search Results: 1 - 10 of 61778 matches for " Antonio Fernando Monteiro Camargo "
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Editorial Editorial
Antonio Fernando Monteiro Camargo
Acta Limnologica Brasiliensia , 2012,
Abstract:
Editorial
Antonio Fernando Monteiro Camargo
Acta Limnologica Brasiliensia , 2011, DOI: 10.1590/s2179-975x2011000400001
Abstract:
Editorial
Antonio Fernando Monteiro Camargo
Acta Limnologica Brasiliensia , 2012,
Abstract:
Characterization and evaluation of the impact of feed management on the effluents of Nile tilapia (Oreochromis niloticus) culture
Baccarin, Ana Eliza;Camargo, Antonio Fernando Monteiro;
Brazilian Archives of Biology and Technology , 2005, DOI: 10.1590/S1516-89132005000100012
Abstract: the objective of this study was to evaluate the effect of different feed management on the quality of effluent water generated in nile tilapia (oreochromis niloticus) culture ponds. feed was supplied as follows: natural food, and pelleted, extruded or minced ration. the study was conducted during 19 weeks in 12 continuous water exchange ponds of 300 m2 each, with a population of male nile tilapia juveniles, in a density equal to 1.7 fish m-2. feeds contained 30% crude protein, 3,000 kcal digestible energy, and were supplied twice a day. natural food consisted of chicken manure. temperature, dissolved oxygen, ph, total phosphorus, total nitrogen, chlorophyll a and suspended solids were monitored weekly in the supplying and effluent water. water residence time was also determined for the ponds. in general, effluent water quality decreased in all treatments.
Photosynthetic rate of the aquatic macrophyte Egeria densa Planch. (Hydrocharitaceae) in two rivers from the Itanhaém River Basin in S?o Paulo State, Brazil
Pezzato, Maura Maria;Camargo, Antonio Fernando Monteiro;
Brazilian Archives of Biology and Technology , 2004, DOI: 10.1590/S1516-89132004000100021
Abstract: egeria densa is a submerged aquatic macrophyte which, in brazil, causes problems specially for electric energy generation. the purpose of this study was to evaluate the photosynthetic rate of e. densa in two rivers (aguapeú and mambu) with different limnological features, both located in the itanhaém river basin. this species is abundant in both rivers without causing damages to their multiple uses. photosynthetic rates were analysed in february, may, august and november 1998 and limnological variables of the water and sediment were also measured. the highest value of gross photosynthesis (gp) was detected in may (10.06 in aguapeú and 6.10 mgo2/gdw/h in mambu), when under-water photosynthetic active radiation (par) was also high (1,126.7 and 895.8 m mol/m/s, respectively). gp, total phosphorous, total co2 and par were always higher in aguapeú river.
Tratamento de efluentes de carcinicultura por macrófitas aquáticas flutuantes
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000200002
Abstract: the efficiency of systems composed of two species of floating aquatic macrophyte (eichhornia crassipes and pistia stratiotes) to treat effluents from shrimp culture was evaluated in this research. the effluent originated from a pond populated with macrobrachium amazonicum. treatment systems consisted of 12 experimental tanks with aquatic macrophyte and three tanks without plants (control). water samples were collected from the fresh water supply and before and after passing through the treatment systems. there are no differences in the removal of nutrients between the two species. the higher nutrient removal was observed for total phosphorus (41.9% by control; 71.6% by e. crassipes; 69.9 by p. stratiotes; 72.5% by e. crassipes + p. stratiotes and 72.1 by p. stratiotes + e. crassipes) and turbidity (30.6% by control; 80.2% by e. crassipes; 75.2 by p. stratiotes; 79.8% by e. crassipes + p. stratiotes and 81.5 by p. stratiotes + e. crassipes). the systems containing aquatic macrophytes were efficient in nitrogen and phosphorus removal from m. amazonicum culture.
Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;
Scientia Agricola , 2006, DOI: 10.1590/S0103-90162006000500003
Abstract: the effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. in this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (eichhornia crassipes, pistia stratiotes and salvinia molesta) to treat effluents from nile tilapia culture ponds. the effluent originated from a 1,000-m2 pond stocked with 2,000 male nile tilapia oreochromis niloticus. the treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the treatment tanks. the following water variables were evaluated: turbidity, total and dissolved nitrogen, ammoniacal-n, nitrate-n, nitrite-n, total phosphorus and dissolved phosphorus. e. crassipes and p. stratiotes were more efficient in total phosphorus removal (82.0% and 83.3%, respectively) and total nitrogen removal (46.1% and 43.9%, respectively) than the s. molesta (72.1% total phosphorus and 42.7% total nitrogen) and the control (50.3% total phosphorus and 22.8% total nitrogen), indicating that the treated effluents may be reused in the aquaculture activity.
Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Henry-Silva Gustavo Gonzaga,Camargo Antonio Fernando Monteiro
Scientia Agricola , 2006,
Abstract: The effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. In this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (Eichhornia crassipes, Pistia stratiotes and Salvinia molesta) to treat effluents from Nile tilapia culture ponds. The effluent originated from a 1,000-m2 pond stocked with 2,000 male Nile tilapia Oreochromis niloticus. The treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). Water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the treatment tanks. The following water variables were evaluated: turbidity, total and dissolved nitrogen, ammoniacal-N, nitrate-N, nitrite-N, total phosphorus and dissolved phosphorus. E. crassipes and P. stratiotes were more efficient in total phosphorus removal (82.0% and 83.3%, respectively) and total nitrogen removal (46.1% and 43.9%, respectively) than the S. molesta (72.1% total phosphorus and 42.7% total nitrogen) and the control (50.3% total phosphorus and 22.8% total nitrogen), indicating that the treated effluents may be reused in the aquaculture activity.
Crescimento de Pistia stratiotes em diferentes condi??es de temperatura e fotoperíodo
Cancian, Leonardo Farage;Camargo, Antonio Fernando Monteiro;Silva, Gustavo Henrique Gonzaga;
Acta Botanica Brasilica , 2009, DOI: 10.1590/S0102-33062009000200027
Abstract: temperature and photoperiod are abiotic variables that directly influence aquatic macrophyte production. they also determine the geographic distribution of the species and affect community structure. the aim of this study was to evaluate the growth of pistia stratiotes in different temperature and photoperiod regimes. p. stratiotes plants were conditioned in growth chambers with controlled temperature and photoperiod. six treatments were used: 1 (15 oc/8 h photoperiod); 2 (15 oc/12 h); 3 (25 oc/8 h); 4 (25 oc/12 h); 5 (30 oc/8 h) and 6 (30 oc/12 h). the highest biomass gain occurred with treatment number 4 which showed significant differences (p<0.05) compared to treatments number 1, 5 and 6. in treatments 1, 5 and 6 the final biomass was lower than the initial biomass of p. stratiotes. the greatest biomass reduction occurred in treatment number 6 which was significantly lower than in treatments 2, 3 and 4. the highest sprout production was observed in treatments at 25 oc, while in treatments at 15 oc and 30 oc sprouting was greatly reduced. we conclude that temperature and photoperiod influence p. stratiotes growth and higher growth rates occurred at 25 oc and 12-hour photoperiod.
Effect of Urucu oil (Brazilian Amazon) on the biomass of the aquatic macrophyte Eichhornia crassipes (Mart.) Solms (Pontederiaceae)
Crema, Luciana Carvalho;Biudes, Jose Francisco Vicente;Camargo, Antonio Fernando Monteiro;
Acta Limnologica Brasiliensia , 2011, DOI: 10.1590/S2179-975X2012005000019
Abstract: the rivers and floodplain lakes of the urucu petroleum-bearing region in central amazonia are extensively colonized by aquatic macrophytes, which may be affected by accidental spills during oil extraction and transportation operations. among the species of macrophytes, the free-floating eichhornia crassipes (water hyacinth) is abundant; aim: the objective of this study was to evaluate the effect of different dosages of urucu crude oil (0, 0.5, 1.5 and 3.0 l.m-2) on the biomass of e. crassipes and on some physical and chemical characteristics of the water in which the plant grew; methods: the experiment was conducted over a period of 84 days. every seven days, the biomass (live and dead) of e. crassipes and the temperature, ph, electrical conductivity and dissolved oxygen in the water were measured; results: the dosage of 0.5 l.m-2 was sufficient to cause partial mortality (48%) in e. crassipes after 35 days of exposure to oil. the dosage of 3.0 l.m-2 caused total mortality (100%) in e. crassipes after 84 days of exposure. the decomposition of the oil and the dead biomass of e. crassipes reduced the dissolved oxygen and ph, and increased electrical conductivity and concentrations of total phosphorus in the water; conclusions: we conclude that an oil spill can cause total mortality in the local population of one macrophyte species, but not of another. this may alter the macrophyte species diversity in the impacted region. in the case of e. crassipes and pistia stratiotes, an urucu crude oil spill could favor e. crassipes, the species less sensitive to oil.
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